chore(release): publish as real-browser-cli

- Rename the PyPI distribution from browser-cli to real-browser-cli after PyPI rejected the original name as too similar to an existing project.
- Keep the installed console command as browser-cli so user-facing CLI usage remains unchanged.
- Add README-based package metadata, author information, and project URLs so PyPI renders a proper project description.
- Centralize the PyPI distribution name for importlib.metadata version lookups used by the CLI, doctor command, and remote user agent.
- Document uv tool install, optional fast extra installation, and upgrade commands.
- Bump package and extension metadata to 0.14.3 for the republished release.

browser_cli/version_manager.py

@@ -1,6 +1,6 @@
 from importlib.metadata import version as _pkg_version
 
-from browser_cli.constants import MAX_MSG_BYTES, PROTOCOL_MIN_CLIENT
+from browser_cli.constants import MAX_MSG_BYTES, PROTOCOL_MIN_CLIENT, PYPI_PACKAGE_NAME
 
 def parse_version(v: str) -> tuple[int, ...]:
     try:
@@ -10,7 +10,7 @@ def parse_version(v: str) -> tuple[int, ...]:
 
 def get_installed_version() -> str:
     try:
-        return _pkg_version("browser-cli")
+        return _pkg_version(PYPI_PACKAGE_NAME)
     except Exception:
         return "0.0.0"